//
//  NilToEmptyStringTransformer.m
//  Statz
//
//  Created by Dave MacLachlan on 2007/11/30.
//
// Copyright 2007 Google Inc.
// 
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License.  You may obtain a copy
// of the License at
// 
// http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
// License for the specific language governing permissions and limitations under
// the License.
//

#import "NilToEmptyStringTransformer.h"


@implementation NilToEmptyStringTransformer
+ (void)load {
  NilToEmptyStringTransformer *transformer;
  transformer = [[[self class] alloc] init];
  [NSValueTransformer setValueTransformer:transformer forName:@"NilToEmptyStringTransformer"];
}

+ (Class)transformedValueClass {
  return [NSString class];
}

+ (BOOL)allowsReverseTransformation {
  return YES;
}

- (id)transformedValue:(id)value {
  if (!value) {
    value = @"";
  }
  return value;
}

@end
